Electrical machine for a motor vehicle, method for producing such an electrical machine, and rotor for such an electrical machine

Abstract

The invention relates to an electrical machine (1) for a motor vehicle, comprising a laminated core (5) as a first component, and comprising at least one end shield (6), which adjoins an axial end face (AS1) of the laminated core (5) in the axial direction (11) of the electrical machine (1) and is arranged on the axial end face (AS1) and is formed separately from the laminated core (5), as a second component, wherein the end shield (6) is screwed to the laminated core (5) and thereby fastened to the laminated core (5).

Description

[0001] Electric machine for a motor vehicle, method for producing such an electric machine and rotor for such an electric machine

[0002] The invention relates to an electric machine for a motor vehicle according to the preamble of patent claim 1. Furthermore, the invention relates to a method for producing such an electric machine according to the preamble of patent claim 6. The invention also relates to a rotor for such an electric machine according to the preamble of patent claim 10.

[0003] DE 102021 102 430 A1 discloses a rotor for an electric machine of a drive train. WO 2020 / 099048 A1 discloses a support device for a rotor of a separately excited internal rotor synchronous machine of an electrically driven motor vehicle. DE 102019 205 101 A1 discloses a method for producing an electromechanical component for an electric machine. Furthermore, EP 3669 439 B1 discloses a rotor for an electric machine. Furthermore, EP 2 793 365 A1 discloses a single-segment rotor. Furthermore, DE 102021 123673 A1 discloses a support device for a rotor of an electric machine.

[0004] The object of the present invention is to provide an electric machine for a motor vehicle, a method for producing such an electric machine and a rotor for such an electric machine, so that the electric machine can be produced particularly advantageously.

[0005] This object is achieved according to the invention by an electric machine having the features of patent claim 1, by a method having the features of patent claim 6, and by a rotor having the features of patent claim 10. Advantageous embodiments of the invention are the subject of the dependent claims. A first aspect of the invention relates to an electric machine for a motor vehicle, also simply referred to as a vehicle. This means that the motor vehicle, preferably designed as a motor vehicle, in particular as a passenger car, has the electric machine in its fully manufactured state and can be driven, in particular purely electrically, by means of the electric machine.The electric machine is preferably a high-voltage component whose electrical voltage, in particular electrical operating or nominal voltage, is preferably greater than 50 volts, in particular greater than 60 volts, and very preferably amounts to several hundred volts. The electric machine has, for example, a rotor and a stator, by means of which the rotor can be driven and is thus rotatable about a machine axis of rotation relative to the stator. For example, the electric machine can provide drive torques via its rotor for driving the motor vehicle, in particular purely electrically. Very particularly, the electric machine is designed as an internal rotor, i.e. as an internal rotor machine, which is also referred to as an internal rotor motor.Preferably, the electrical machine is designed as a separately excited and / or current excited synchronous machine, which is also referred to as a separately excited and / or current excited synchronous motor (SSM).

[0006] The electric machine has a laminated core. In principle, it would be conceivable for the laminated core to be a component of the stator, so that the laminated core is designed, for example, as a stator laminated core. However, it has proven particularly advantageous for the laminated core to be a component of the rotor, so that the laminated core is preferably designed as a rotor laminated core of the rotor. The laminated core is also referred to as the first component. In other words, the laminated core is a first component of the electric machine.

[0007] The electrical machine has at least one end plate which adjoins an axial end face of the laminated core in the axial direction of the electrical machine, the radial direction of which runs perpendicular to the axial direction of the electrical machine, so that in particular the end plate adjoins the laminated core in the axial direction of the electrical machine. The axial direction of the electrical machine coincides with the machine axis of rotation. The end plate is arranged, in particular directly, on the axial end face so that, for example, the end plate touches the axial end face, in particular directly. In addition, the end plate is formed separately from the laminated core. Thus, the laminated core is preferably formed separately from the end plate so that, for example, the end plate is not part of the laminated core.In particular, the end plate is supported directly on the axial end face of the electric machine, and thus of the rotor and stator, so that, for example, the end plate directly touches the axial end face of the laminated core. The axial direction of the electric machine coincides with the axial direction of the stator and the axial direction of the rotor. The end plate is a second component of the electric machine. In other words, the end plate is also referred to as the second component.

[0008] For example, the end plate can be a star plate, which is already disclosed, for example, in DE 102018 128 521 A1. In particular, the axial end face of the laminated core is understood to be an end face of the laminated core whose axial end face extends in a plane perpendicular to the axial direction of the electric machine and thus of the rotor and stator.

[0009] For example, the electric machine has at least one winding, which can be a winding of the stator and thus a stator winding, or the winding is a winding of the rotor and thus a rotor winding. For example, the winding, which is formed in particular separately from the laminated core, is carried by the laminated core and thus fastened to the laminated core, in particular by the winding being wound around at least a partial region of the laminated core. For example, a magnetic field can be generated by means of the winding, in particular by applying an electrical voltage to the winding, by means of which magnetic field the rotor can be driven and thus rotated about the machine axis of rotation relative to the stator.

[0010] For example, the rotor has a shaft, particularly one formed separately from the laminated core, also referred to as the rotor shaft. Especially when the laminated core is a component of the rotor, the laminated core is arranged on the shaft. In particular, the laminated core is connected to the shaft in a rotationally fixed manner.

[0011] In order to be able to manufacture the electrical machine in a particularly advantageous manner, in particular in a particularly time- and cost-effective manner, the invention provides that the end plate is screwed to the laminated core and is thereby fastened to the laminated core.

[0012] The invention enables advantageous and particularly captive mounting of the end plate on the laminated core, particularly during a method for manufacturing the electrical machine, so that undesired, excessive relative movements between the end plate and the laminated core can be advantageously and easily avoided, particularly during the method for manufacturing the electrical machine. Because the end plate is screwed to the laminated core in the invention, a fastening of the end plate to the laminated core in the form of a screw connection is created, wherein this fastening can provide advantageous and particularly captive mounting of the end plate on the laminated core during the method for manufacturing the electrical machine.

[0013] By means of the fastening, the end plate can be advantageously fixed, in particular pre-fixed, to the laminated core in such a way, particularly during the method for producing the electrical machine, that excessive relative movements between the end plate and the laminated core are prevented, wherein, when the end plate is fastened to the laminated core by means of the screw connection, undesirable effects such as the formation of chips and / or other undesirable particles can be avoided.

[0014] In the said method for producing the electrical machine, it is provided, for example, that in a first step of the method, the end plate is fastened to the laminated core by means of the screw connection, in particular while the winding is not yet fastened to the laminated core. In a second step of the method, which follows the first step, the winding is fastened to the laminated core, in particular such that the winding is wound at least around the said partial area of ​​the laminated core. In this case, for example, the winding is also wound around at least a partial area of ​​the end plate, so that the end plate is fastened to the laminated core particularly firmly, for example by means of the winding. It is therefore desirable to fix the end plate, in particular in a captive manner, to the laminated core in the first step of the method, in particular to pre-fix it, whereby the winding is not yet available for this purpose.The invention now makes it possible to fix the end plate to the laminated core in a particularly advantageous and, in particular, particularly simple manner, without using the winding for this purpose and in particular without causing undesirable effects. The invention enables, in particular in the first step of the method mentioned, an advantageous fastening, in particular pre-fixing, of the end plate to the laminated core, wherein this fastening of the end plate to the laminated core is robust with regard to tolerance fluctuations. Typically, pins made of a metallic material such as aluminum are used to fasten the end plate to the laminated core, in particular in the first step of the method mentioned. The pins are inserted into corresponding pockets, which deliberately results in the pins being scraped off. For example, the pins are provided on the laminated core so that, for example, the pockets are provided on the end plate.However, shaving off the pins can result in chips that can subsequently impair the manufacture of the electrical machine if appropriate countermeasures are not taken. To prevent such undesirable interference, complex measures may be necessary. The invention prevents the formation of such particles or chips, thus obviating the need for appropriate countermeasures. Thus, the electrical machine can be manufactured quickly and cost-effectively.

[0015] In order to manufacture the electrical machine particularly advantageously, in particular particularly time- and cost-effectively, one embodiment of the invention provides for the end plate to be screwed to the laminated core by means of at least one screw element formed separately from the laminated core and the end plate, which is also referred to as the first screw element. When reference is made above and below to the screw element, this refers to the first screw element, unless otherwise stated.Preferably, the end plate is screwed to the laminated core by means of at least two screw elements formed separately from the laminated core and separately from the end plate, namely by means of the first screw element and by means of a second screw element. The previous and following statements regarding the first screw element can also be readily applied to the second screw element and vice versa. In particular, the screw elements are formed separately from one another.

[0016] For example, the screw element can be thread-cutting and thus self-tapping, so that in the aforementioned method for producing the electrical machine, for example, the laminated core is provided with an opening in the laminated core, wherein, for example, the opening is initially thread-free. This means that initially no thread is arranged or formed in the opening. For example, the opening is designed as a blind hole. The opening can be produced, for example, by machining the laminated core, in particular by machining it, whereby the opening is produced, so that the opening is produced by machining, in particular by machining it, of the laminated core. The laminated core is formed, for example, from sheet metal segments, which are also referred to as individual sheets and are produced, for example, by punching.During the production, in particular punching, of the sheet metal segments, the sheet metal segments can be produced particularly easily and thus time- and cost-effectively in such a way that the sheet metal segments form the opening when the sheet metal stack is fully manufactured, so that the opening can be produced time- and cost-effectively. It is therefore conceivable that by punching the sheet metal segments, the sheet metal segments are produced in such a way that the sheet metal segments form the opening when the sheet metal stack is fully manufactured, so that, for example, producing the opening by machining the sheet metal stack is omitted. If the screw element is designed to be thread-cutting, for example, the screw element is rotated about a screw rotation axis relative to the sheet metal stack and thereby screwed into the opening, whereby the screw element cuts a thread, in particular an internal thread, into the at least thread-free opening.For this purpose, for example, the screw element has a thread-cutting external thread corresponding to the internal thread, by means of which the internal thread is cut into the opening when the screw element is screwed into the at least thread-free opening.

[0017] Furthermore, it is conceivable that, for example, after the provision of the laminated core having the opening, a thread, in particular in the form of an internal thread, is cut into the opening by means of a device formed separately from the laminated core and separately from the corresponding screw element and in particular also separately from the end plate and thus produced in the opening, whereupon, for example, the screw element, in particular with its external thread corresponding to the internal thread, is screwed into the previously produced internal thread, in particular in order to screw the end plate to the laminated core.

[0018] In order to be able to particularly advantageously attach and thus fix, in particular pre-fix, the end plate to the laminated core, a further embodiment of the invention provides for the screw element to penetrate a preferably thread-free through-hole in the end plate, in particular in the axial direction of the electrical machine, the radial direction of which runs perpendicular to the axial direction of the electrical machine. The axial direction of the electrical machine coincides with the machine's axis of rotation. In order to be able to manufacture the electrical machine particularly quickly and cost-effectively, a further embodiment of the invention provides for the screw element to be screwed directly into the laminated core.For this purpose, the screw element has a first thread, designed, for example, as an external thread, which is screwed directly into the laminated core, in particular into a second thread corresponding to a first thread and designed, for example, as an internal thread. This allows the number of parts and thus the cost and weight of the electrical machine to be kept to a particularly low level.

[0019] In a further, particularly advantageous embodiment of the invention, the laminated core has an internal thread into which an external thread of the screw element corresponding to the internal thread is directly screwed, whereby the screw element is screwed directly into the laminated core. This allows for a particularly advantageous direct screw connection, so that the end plate can be advantageously attached to the laminated core and thus fixed, in particular pre-fixed.

[0020] It has proven particularly advantageous if the laminated core is designed or manufactured using what is known as baking varnish technology. This means that the laminated core preferably has the aforementioned sheet metal segments and a baking varnish by means of which the sheet metal segments are connected to one another, in particular in such a way that the sheet metal segments are glued to one another by means of the baking varnish and are thereby connected to one another. As a result, the laminated core is designed as an at least substantially solid block into which the screw element can be screwed, in particular in such a way that the internal thread is produced, for example, by screwing the screw element directly into the laminated core, and that the internal thread can be produced particularly advantageously by means of the device.

[0021] A second aspect of the invention relates to a method for producing an electrical machine, in particular according to the first aspect of the invention, for a motor vehicle, also simply referred to as a vehicle. In the method, a laminated core is provided as the first component. In the method, at least one end plate formed separately from the laminated core is provided as the second component. In the method, the end plate is arranged on an axial end face of the laminated core in such a way that the end plate adjoins the axial end face of the laminated core in the axial direction of the electrical machine and thus in particular adjoins the laminated core as a whole.

[0022] In order to manufacture the electrical machine particularly advantageously, in particular particularly time- and cost-effectively, the second aspect of the invention provides for the end plate to be screwed to the laminated core and thereby secured to the laminated core. Advantages and advantageous embodiments of the first aspect of the invention are to be regarded as advantages and advantageous embodiments of the second aspect of the invention, and vice versa.

[0023] In order to be able to manufacture the electrical machine particularly simply and thus in a time- and cost-effective manner, one embodiment of the second aspect of the invention provides that the end plate is screwed to the laminated core by means of at least one screw element formed separately from the laminated core and separately from the end plate.

[0024] It has proven particularly advantageous if the screw element is designed to be thread-cutting and thus self-tapping. The screw element is screwed directly into an initially unthreaded opening in the laminated core, thereby cutting an internal thread into the laminated core as the screw element is screwed into the initially unthreaded opening. This allows the electrical machine to be manufactured particularly quickly and cost-effectively.

[0025] In order to be able to manufacture the electrical machine particularly easily, it is provided in a further embodiment of the second aspect of the invention that, before the end plate is screwed to the laminated core by means of the screw element, an internal thread is cut into an at least thread-free opening of the laminated core by means of a device formed separately from the laminated core, separately from the end plate and separately from the screw element, whereupon the screw element is screwed directly into the internal thread, whereby the end plate is screwed to the laminated core by means of the screw element.

[0026] A third aspect of the invention relates to a rotor for an electric machine of a motor vehicle, having a laminated core as the first component, and having at least one end plate as the second component, which adjoins an axial end face of the laminated core in the axial direction of the rotor and thus of the electric machine and thus in particular adjoins the laminated core as a whole and is arranged on the axial end face and is formed separately from the laminated core.

[0027] In order to manufacture the rotor and thus the electric machine particularly advantageously, in particular particularly time- and cost-effectively, the third aspect of the invention provides for the end plate to be screwed to the laminated core and thereby secured to the laminated core. Advantages and advantageous embodiments of the first aspect and the second aspect of the invention are to be regarded as advantages and advantageous embodiments of the third aspect of the invention, and vice versa.

[0028] Also disclosed is a motor vehicle, also simply referred to as a vehicle, which is preferably designed as a motor vehicle, in particular as a passenger car. The motor vehicle has at least one electric machine according to the first aspect of the invention and can be driven, in particular purely electrically, by means of the electric machine. Advantages and advantageous embodiments of the first aspect, the second aspect, and the third aspect of the invention are to be regarded as advantages and advantageous embodiments of the motor vehicle, and vice versa.

[0029] Further details of the invention will become apparent from the following description of a preferred embodiment with the accompanying drawings. In the drawings:

[0030] Fig. 1 shows a partial schematic and sectional perspective view of an electrical machine for a motor vehicle;

[0031] Fig. 2 shows a partial schematic longitudinal sectional view of a rotor of the electric machine; and

[0032] Fig. 3 shows a partial schematic exploded view of the rotor;

[0033] Fig. 4 is a schematic plan view of a laminated core of the rotor; and

[0034] Fig. 5 shows a partial schematic perspective view of the laminated core.

[0035] In the figures, identical or functionally equivalent elements are provided with the same reference numerals. Fig. 1 shows a detail in a schematic and sectional perspective view of an electric machine 1 of a motor vehicle, also simply referred to as a vehicle, which is preferably designed as a motor vehicle, in particular as a passenger car. The electric machine 1 has a stator 2, shown in detail and particularly schematically in Fig. 1, and a rotor 3, which can be driven by means of the stator 2 and is thus rotatable about a machine axis of rotation 4 relative to the stator 2. Via the rotor 3, the electric machine 1 can provide drive torques for driving the motor vehicle, in particular purely electrically.

[0036] The rotor 3 and thus the electric machine 1 have a laminated core 5, which is also referred to as the first component or is a first component of the rotor 3 and thus of the electric machine 1. The laminated core 5 has, in particular, individual laminated core segments, which are also referred to as individual laminations. The laminated core 5 is formed from the laminated core segments, in particular assembled. For example, the laminated core 5 also has a baked varnish, by means of which the laminated core segments are connected to one another, in particular glued to one another and thereby connected to one another. Thus, for example, the laminated core 5 is manufactured using what is known as baked varnish technology.

[0037] The rotor 3 and thus the electric machine 1 also have an end plate 6 which is formed separately from the laminated core 5 and which, in the exemplary embodiment shown in the figures, is designed as a star plate. The end plate 6 is a second component of the electric machine 1. This means that the end plate 6 is also referred to as the second component. In the axial direction of the rotor 3 and thus of the electric machine 1, the end plate 6 adjoins an axial end face AS1 and thus in particular the laminated core 5. The axial direction of the rotor 3, whose radial direction runs perpendicular to the axial direction of the rotor 3 and thus of the electric machine 1 as a whole, coincides with the machine rotation axis 4. The axial direction of the rotor 3 and thus of the electric machine 1, whose radial direction runs perpendicular to the axial direction of the electric machine 1, is illustrated by a double arrow 11.The radial direction of the rotor 3 and thus of the electric machine 1 is illustrated by a double arrow 7. The end plate 6 is arranged on the axial end face AS1 of the laminated core 5 and, in particular, is supported directly on the axial end face AS1, so that, for example, the end plate 6 directly touches the axial end face AS1 of the laminated core 5. In order to be able to manufacture the rotor 3 and thus the electric machine 1 particularly advantageously, the end plate 6 is screwed to the laminated core 5 and thus fastened to the laminated core 5.

[0038] In the exemplary embodiment shown in the figures, a plurality of screw elements 8 are provided, which are designed as screws and are separate from the laminated core 5 and separate from the end plate 6 and separate from one another. The end plate 6 is screwed to the laminated core 5 by means of the screw elements 8. Preferably, at least or exactly two screw elements 8 are provided. For example, at least or exactly three screw elements 8 are provided. In particular, more than two, in particular more than three, screw elements 8 can be provided. For example, at least or exactly six screw elements 8 or more than six screw elements 8 are provided in order to screw the end plate 6 to the laminated core 5. In the exemplary embodiment shown in the figures, exactly six screw elements 8 are provided, by means of which the end plate 6 is screwed to the laminated core 5.

[0039] 1 to 5 that a respective corresponding opening 9 of the laminated core 5 is assigned to the respective screw element 8, wherein the respective opening 9 is designed, for example, as a respective blind hole. The respective opening 9 is formed in the laminated core 5. The respective opening 9 is formed and thus produced in the laminated core 5 in such a way that, for example, the laminated core 5 is machined, in particular drilled, so that, for example, the respective opening 9 is produced by machining, in particular drilling, of the laminated core 5. Furthermore, it is conceivable that the laminated core segments of the laminated core 5 are or will be produced, in particular by punching, in such a way that the laminated core segments form the respective opening 9 in the fully manufactured state of the laminated core 5, in particular without producing the respective opening 9 by machining the laminated core 5.In other words, the sheet metal segments are or will preferably be produced in particular by punching in such a way that by assembling the sheet metal segments to form the sheet metal package 5, the sheet metal segments form the respective opening 9 in the completely manufactured state of the sheet metal package 5.

[0040] Furthermore, a respective through-opening 10 of the end plate 6 is assigned to the respective screw element 8, wherein the respective screw element 8 in particular completely penetrates the through-opening 10 assigned to it, in particular in the axial direction of the rotor 3 and thus of the electrical machine 1. Preferably, the respective through-opening 10 is thread-free, so that preferably no thread is arranged in the respective through-opening 10.

[0041] The respective screw element 8 has a respective first thread, which in this case is designed as an external thread. In principle, it would be conceivable for the respective screw element 8, in particular its respective external thread, to be designed to be thread-cutting, so that, for example, in a method for producing the rotor 3, the laminated core 5 is provided with the initially thread-free openings 9. For example, the method for producing the rotor 3 is a component of a method for producing the electrical machine 1 as a whole. In the method, for example, the respective screw element 8 is screwed directly into the respective corresponding and initially thread-free opening 9 of the laminated core 5, whereby the respective screw element 8 cuts a respective internal thread into the respective assigned and initially thread-free opening 9, corresponding to the respective external thread of the respective screw element 8.

[0042] Alternatively, it is conceivable that in the method for producing the rotor 3, an internal thread is cut into the respective, initially thread-free opening 9 of the laminated core 5 by means of a device formed separately from the laminated core 5 and separately from the end plate 6 and separately from the screw elements 8, before the end plate 6 is screwed to the laminated core 5 by means of the screw elements 8. After the respective internal thread has been cut into the respective opening 9, the respective screw element 8, in particular its respective external thread, is screwed into the respective corresponding internal thread of the respective opening 9, previously produced by means of the device, whereby the end plate 6 is screwed to the laminated core 5.

[0043] The rotor 3 has, for example, a winding (not visible in the figures), which is also referred to as the rotor winding. When the rotor 3 is fully manufactured, the winding is attached to the laminated core 5 and thus supported by the laminated core 5. In particular, the winding is attached to the laminated core 5 in such a way that the winding is wound around at least a partial area of ​​the laminated core 5. In addition, for example, the winding is wound around at least a partial area of ​​the end plate 6. In the method for producing the rotor 3, it is provided, for example, that the end plate 6 is screwed to the laminated core 5, while the winding is not yet attached to the laminated core 5 and thus not yet wound around the laminated core 5 and not yet around the end plate 6.Preferably, the winding is wound at least around the partial area of ​​the laminated core 5 and preferably also at least around the partial area of ​​the end plate 6 only after the end plate 6 has been screwed to the laminated core 5, and is thereby fastened to the laminated core 5 and in particular also to the end plate 6. By fastening the winding to the laminated core 5 and to the end plate 6 in this way, the end plate 6, for example, is particularly firmly connected to the laminated core 5.

[0044] The respective screw element 8 forms a respective screw connection, by means of which the end plate 6 is screwed to the laminated core 5 and thereby fastened to the laminated core 5. It can be seen that the screw connections are used to fasten the end plate 6 to the laminated core 5 without the aid of the winding and thus to fix it, in particular to pre-fix it. As a result, the end plate 6 can be held captively on the laminated core 5 and thus pre-fixed before the winding is fastened to the laminated core 5 and to the end plate 6, in particular in such a way that relative movements between the end plate 6 and the laminated core 5 are prevented.

[0045] Fig. 2 shows a section of the rotor 3 in a schematic longitudinal sectional view. Two of the screw elements 8 as well as the associated and thus assigned openings 9 of the laminated core 5 and the associated and associated, thread-free through-openings 10 of the end plate 6 are particularly clearly visible in Fig. 2.

[0046] Fig. 3 shows a schematic exploded view of the rotor 3, in which the laminated core 5, the end plate 6 and the screw elements 8 can be seen particularly well.

[0047] Fig. 4 shows a schematic plan view of the laminated core 5. The openings 9 of the laminated core 5 are particularly clearly visible in Fig. 4, wherein the internal threads can be cut into the openings 9 in a particularly advantageous manner, for example either by means of the screw elements 8 or by means of the device mentioned above.

[0048] Fig. 5 shows a section of the laminated core 5 in a schematic perspective view, with one of the openings 9 being particularly clearly visible in Fig. 5. List of reference symbols

[0049] 1 electric machine

[0050] 2 Stator

[0051] 3 Rotor

[0052] 4 machine rotation axis

[0053] 5 sheet package

[0054] 6 End plate

[0055] 7 Double arrow

[0056] 8 screw element

[0057] 9 Opening

[0058] 10 passage opening

[0059] 11 Double arrow

[0060] AS1 axial end face

Claims

Patent claims 1. Electrical machine (1) for a motor vehicle, with a laminated core (5) as the first component, and with at least one end plate (6) as the second component, which adjoins an axial end face (AS1) of the laminated core (5) in the axial direction (11) of the electrical machine (1) and is arranged on the axial end face (AS1) and is formed separately from the laminated core (5), characterized in that the end plate (6) is screwed to the laminated core (5) and is thereby fastened to the laminated core (5).

2. Electrical machine (1) according to claim 1, characterized in that the end plate (6) is screwed to the laminated core (5) by means of at least one screw element (8) formed separately from the laminated core (5) and separately from the end plate (6).

3. Electrical machine (1) according to claim 2, characterized in that the screw element (8) penetrates a through opening (10) of the end plate (6).

4. Electrical machine (1) according to claim 3, characterized in that the screw element (8) is screwed directly into the laminated core (5).

5. Electrical machine (1) according to claim 4, characterized in that the laminated core (5) has an internal thread into which an external thread of the screw element (8) corresponding to the internal thread is directly screwed, whereby the screw element (8) is screwed directly into the laminated core (5).

6. A method for producing an electrical machine (1) for a motor vehicle, in which: - a laminated core (5) is provided as the first component; - at least one end plate (6) formed separately from the laminated core (5) is provided as a second component; and - the end plate (6) is arranged on an axial end face (AS1) of the laminated core (5) in such a way that the end plate (6) adjoins the axial end face (AS1) of the laminated core (5) in the axial direction (11) of the electrical machine (1), characterized in that the end plate (6) is screwed to the laminated core (5) and is thereby fastened to the laminated core (5).

7. Method according to claim 6, characterized in that the end plate (6) is screwed to the laminated core (5) by means of at least one screw element (8) formed separately from the laminated core (5) and separately from the end plate (6).

8. Method according to claim 7, characterized in that the screw element (8) is designed to be thread-cutting, wherein the screw element (8) is screwed directly into an initially thread-free opening (9) of the laminated core (5) and thereby cuts an internal thread of the laminated core (5) during the screwing of the screw element (8) into the initially thread-free opening (9).

9. Method according to claim 7, characterized in that before the end plate (6) is screwed to the laminated core (5) by means of the screw element (8), an internal thread is cut into an initially thread-free opening (9) of the laminated core (5) by means of a device formed separately from the laminated core (5), separately from the end plate (6) and separately from the screw element (8), whereupon the screw element (8) is screwed directly into the internal thread is screwed in, whereby the end plate (6) is screwed to the laminated core (5) by means of the screw element (8).

10. Rotor (3) for an electrical machine (1) of a motor vehicle, with a laminated core (5) as the first component, and with at least one end plate (6) as the second component, which adjoins an axial end face (AS1) of the laminated core (5) in the axial direction (11) of the rotor (3) and is arranged on the axial end face (AS1) and is formed separately from the laminated core (5), characterized in that the end plate (6) is screwed to the laminated core (5) and is thereby fastened to the laminated core (5).

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